body {
     /*background: #eeeeee 0 0 no-repeat;*/
     background: url(../images/m-r.jpg) no-repeat center;
     /*这个url要用那个写？【找不到资源？？？【why？？？】*/
     /*没用？？？*/
     background-size: cover;
     overflow: hidden;
 }
h1{
    color: red;
    text-align: center;
    padding: 250px;
}